wire status and RSVP to real singletons

[shreeyaadhikari]

Status and RSVP now use real singleton data and authenticated server-side writes

🎫 Issue #500

▶ Changelist:

• Replaced the mock status dates with real singleton values.
• Removed the old mock singleton file so it cannot be used by mistake.
• Added RSVP saving logic that checks if the user is admitted, checks the deadline, and saves the RSVP data.
• Gated the status and RSVP endpoints so only signed-in users can use them.
• Updated the RSVP form to match the new confirmed/unconfirmed RSVP values.

📝 Notes + 🚧 TODO:

• If a singleton date is missing, the app fails safely instead of breaking.
• Still need to finish a full manual test with a real admitted user to confirm the dashboard updates right after RSVP.

🧪 Testing:

• Checked the touched files with TypeScript/error validation.
• Verified the RSVP and status routes return the right success and error paths in code.
• Tried to run the app build, but it still fails because of the existing next-auth module resolution problem.

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Project	Deployment	Actions	Updated (UTC)
core-live	Ready	Preview	Aug 10, 2026 11:45pm
core-main	Ready	Preview	Aug 10, 2026 11:45pm